ee See, eee ee pe 
BROADHURST: STRUTHIOPTERIS IN NorTH AMERICA 261 
STRUTHIOPTERIS (Hall.) Scop. 
Key to the non-petioled species; 
A. STERILE PINNAE NEVER PETIOLED, THE WHOLLY ADNATE BASE THE WIDEST PART 
OF THE PINNA; RHIZOME SCALES NEVER RIGID; PINNAE LACKING 
SCALES; INDUSIUM NOT LACERATE WITH AGE 
Plants epiphytic; rhizome wide-creeping; rhizome scales 
b 
e, I 
18 cm. long, straight or nearly so, the middle ones always 
Straight. 1. S. ensiformis. 
Lamina linear or very narrowly oblong to broadly lance- 
olate, gradually to abruptly reduced at the base 
(type G to D, with vestigial pinnae in D only); pinnae 
base (type G to F, rarely E); leaf tissue rigid- 
——____ herbaceous; pinnae usually contiguous. 7. S. polypodiotdes. 
a intramarginal character of the indusium is obscured in many of the pinnate 
ipod the thickened edges of the pinnae, due to the more or less glandular 
€ vein apices. In the sterile pinnae these thickenings may result 
» Slight swellings, circular cartilaginous areas or depressions, or occasion- 
€ss detachable scalelike elevations. 
- i Species having petioled sterile pinnae will be discussed in a later number 
ULLETIN OF THE TorREY BoTANicaL CLus. The sterile fronds of the 
ies are cut to the rachis, but the bases of the pinnae are wholly ad- 
8 in a few specimens of S. ensiformis, the base is always the widest 
Part 9 : 
ea Pinna. Fée and others classify these as pinnatifid. Petiole instead of 
' sa Is used throughout when referring to the pinnae. 
bases FIGURE 1, which gives several diagrams illustrating the variation in the 
of the la nae. 
